[PD] [vcf~] and [biquad~] filters

Dan Neveu neveu at buffalo.edu
Mon May 17 20:09:18 CEST 2004

Do you have access to the Jimmies lib?

I don't have them myself. I just know there're additional filters provided.


On Mon, 17 May 2004 julien.breval at tremplin-utc.net wrote:

> Hello
> In June I will participate to a concert in which we all have to use Max/MSP. 
> Therefore I am currently porting some of my Pd patches to MSP, and I have some 
> problems with bandpass filtering.
> In Pd, I use [vcf~]. I don't find any MSP filter that has a similar sound. 
> With MSP filters like [svf~], [filtergraph] or [reson~], if you raise Q, you 
> can still hear lots of frequencies that are only more or less attenuated. With 
> [vcf~] some frequencies can disappear if you raise Q (actually, they are very 
> much attenuated so you don't hear them). I prefer this sound.
> The right solution sould be to use [biquad~]. MSP-[biquad~] looks like Pd-
> [biquad~] with some arguments inversed. 
> Unfortunately, besides a paper from Harmony Central I didn't find much 
> information on it. Do you know any documentation about biquad filters ?
> How do you make the simplest (linear) bandpass filter  using [biquad~] 
> (parameters should be F and Q) ? I don't find any working conversion algorithm 
> from (F,Q) to (bb1, bb2, ff1, ff2, ff3). 
> I need something that resembles a '^' rather than a -90°rotated-'{', for any 
> (Q,F) parameters  :) 
> Thanks a lot
> j
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